There are two buckets. The capacity of barrel A is 400 liters, and that of barrel B is 150 liters. If the water discharged from barrel A is twice as much as that from barrel B, and the remaining water in barrel A is four times as much as that from barrel B ... How many liters of water is released per barrel?
There are two plugs in the water tank. Pull off the first plug, and the water in the water tank will flow out after 5 minutes. Pull the second plug and it will flow out in 7 minutes. If the two plugs are pulled out for 2 minutes, a * * * will drain 1200 liters, and then plug in the first plug. How long does it take to drain the water in the tank? 4. It takes two hours for Party B to finish the rest after Party A completes half of a task. If Party A completes the remaining tasks after 3 1, it will take two people * * * 1 hour for 50 minutes. How many hours does it take for Party A and Party B to complete?
A project was originally planned to be completed by 270 workers in a few days. There are only 200 workers at present. As the work efficiency was increased by 50%, the result was advanced by 10 days. Seek the original planned working days?
6. The lathe shift originally planned to produce 50 parts every day. After improving the operation method, in fact, six more parts are produced every day than originally planned. The result was 5 days ahead of schedule, exceeding 8 parts. How many parts did the lathe shift originally plan to produce?
7. The number of parts produced by workers A, B and C in a factory every day, the ratio of A to B is 3: 4, and that of B to C is 2: 3. If the number of pieces produced by B per day is 945 less than the sum of A and C, how many pieces will each worker produce?
8. A project is completed by two teams, team A and team B. It takes 16 days for team A to complete it alone, and 12 days for team B to complete it alone. If Team A works for four days first, and then two teams work together, how many days will it take to complete the project?
9, a worker in the planned time processing a batch of parts, if less than 35 per hour, 10 will not be able to complete the task; If you do 40 per hour, you can exceed 20. How many parts does he process and how many hours is the planned time? 10, two shift workers, according to the plan, 680 parts should be produced this month. In fact, the first group overfulfilled the task by 20%, and the second group overfulfilled the task by 15%, so it produced 1 18 more parts than originally planned. How many parts did each group originally plan to produce this month?
10. A school is going to organize 290 students to make a field trip, with 100 pieces of luggage. The school plans to rent 8 cars of A and B. It is understood that A can carry up to 40 people and 0 pieces of luggage 10, and B can carry up to 30 people and 20 pieces of luggage.
(1) car rental, please help the school design all possible car rental schemes;
(2) If the car rental expenses of A and B are 2000 yuan and 1800 yuan respectively, please choose the most economical car rental scheme.
1 1. A section of expressway under construction needs bidding, which can be completed in 24 days with the cooperation of two engineering teams, and the cost is 1.2 million yuan; If Party A works alone for 20 days, the remaining works will be done by Party B, which will take 40 days to complete, and it will cost 165438+ ten thousand yuan.
Q:
(1) How many days will it take for Team A and Team B to finish this project alone?
(2) How much do two construction teams, A and B, need to complete this project?
12. One construction team 1.5w yuan a day, one construction team 1. 1w yuan a day. There are three kinds of construction schemes: ① Team A completed the project alone, only as planned; (2) The team completed it alone for 5 days more than the specified date; (3) Party A and Party B cooperate for 4 days, and the rest will be completed by the construction team alone or on schedule. Which scheme is more economical without delaying the construction period?